Mercedes-benz 230e U1990 Engine Error Code

When you check Mercedes-benz 230e car engine light came on code U1990 the reason should be . However Mercedes-benz manufacturer may have a different definition for the U1990 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.

U1990 Mercedes-benz 230e Code Clear

To solve U1990 Mercedes-benz 230e problem, you'll have to remove the muffler, crankcase and other components blocking the valve chamber. Then, remove the cylinder head bolts (label for easy re-installation) Adjust the jaws of the valve spring compressor until they touch the top and bottom of the valve chamber Push the tool in to compress the spring and tighten the jaws Remove the retainers and lift out the valves , compressors and springs

U1990 Code Reason

Mercedes-benz 230e U1990 OBD-II Diagnostic Network (U) Trouble Code Description

so you have to check ODB-II Engine Error Code list.

Reason For Mercedes-benz 230e U1990 Code

The reason of Mercedes-benz 230e U1990 OBD-II Engine Error Code is .

If your vehicle failed a U1990 Mercedes-benz 230e test and the Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look U1990 Mercedes-benz 230e: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression.

Mercedes-benz 230e U1990 Possible Solution :

Power Steering Pressure (PSP) Switch Signal Malfunction The PCM counts the number of times vehicle speed transitions from 0 to a calibratable speed. After a calibratable number of speed transitions the PCM expects that the PSP input should have changed. This DTC is set if the transition is not detected. Vehicle towed with engine running Power steering hydraulic concern was repaired but DTC was not erased PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged Check, if possible, if vehicle was towed or power steering service was performed. Observe PSP V PID while checking wires for intermittents.

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